Revisiting the vortex-core tunnelling spectroscopy in YBa2Cu3O7−δ

Jens Bruér, Ivan Maggio-Aprile, Nathan Jenkins, Zoran Ristić, Andreas Erb, Christophe Berthod, Øystein Fischer and Christoph Renner ()
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Jens Bruér: University of Geneva
Ivan Maggio-Aprile: University of Geneva
Nathan Jenkins: University of Geneva
Zoran Ristić: University of Geneva
Andreas Erb: Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften
Christophe Berthod: University of Geneva
Øystein Fischer: University of Geneva
Christoph Renner: University of Geneva

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract The observation by scanning tunnelling spectroscopy of Abrikosov vortex cores in the high-temperature superconductor YBa2Cu3O7−δ (Y123) has revealed a robust pair of electron-hole symmetric states at finite subgap energy. Their interpretation remains an open question because theory predicts a different signature in the vortex cores, characterized by a strong zero-bias conductance peak. Here, we present scanning tunnelling spectroscopy data on very homogeneous Y123 at 0.4 K revealing that the subgap features do not belong to vortices: they are actually observed everywhere along the surface with high spatial and energy reproducibility, even in the absence of magnetic field. Detailed analysis and modelling show that these states remain unpaired in the superconducting phase and belong to an incoherent channel, which contributes to the tunnelling signal in parallel with the superconducting density of states.

Date: 2016
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DOI: 10.1038/ncomms11139

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